add absent filed to model

src/stats/migrations/0003_auto_20190122_1449.py

+# Generated by Django 2.0.1 on 2019-01-22 13:49
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('account', '0002_auto_20190122_1341'),
+        ('stats', '0002_event_description'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='event',
+            name='absent',
+            field=models.ManyToManyField(blank=True, related_name='events_absent', to='account.Profile'),
+        ),
+        migrations.AlterField(
+            model_name='event',
+            name='visitors',
+            field=models.ManyToManyField(blank=True, related_name='events_visitor', to='account.Profile'),
+        ),
+    ]

src/stats/models.py

 from django.db import models
 from account.models import Profile
 from common.middleware import CurrentUserMiddleware
-from django.utils import timezone
-from django.core.exceptions import ValidationError
 
 
 class Event(models.Model):
@@ -11,7 +9,12 @@ class Event(models.Model):
     description = models.TextField(blank=True, default='')
     visitors = models.ManyToManyField(
         Profile,
-        related_name='events',
+        related_name='events_visitor',
+        blank=True
+    )
+    absent = models.ManyToManyField(
+        Profile,
+        related_name='events_absent',
         blank=True
     )
     created_by = models.ForeignKey(